Is it poosible to use this look up table

B7 Bolton
CH56 Cheshire
HU7 Hull
600 of these


to add to the full post code to create this

B7 1QR Bolton
CH56 8SX Cheshire
HU7 9FG Hull
B7 2QR Bolton
CH56 5fX Cheshire
HU7 8SG Hull
19000 of these


Any help would be greatly appreciated.

Paul.